MultiTexture Map
MultiTexture Map is a plugin for 3dsmax that loads multiple textures and assigns them randomly, either by object or by material ID. With controls to randomly adjust the gamma, hue and saturation.

Version 2.01 works with 3ds Max from 2012 up to the current 2019 release. It's compatible with scanline, Vray, Brazil and FinalRender. MentalRay is currently not supported.